She will be able to go back and get her things. Technically, she can refuse to vacate the home and then eviction proceddings will begin.
A few things can happen.
1.) The house goes to sale. Then the new buyers have time to get the money together and purchase the home. During this time the old owner can remain in the house. After the new owners close, they will be responsible for having the old owner removed.
2.) The house doesn't sell. The house then reverts back to the mortgage company. They can begin eviction proceedings.
Also, some companies will offer compensation for leaving right away.
She may want to look into filing bankruptcy. First, it will allow her to remain in the home for some time (if she wants). Secondly, it will stop the auction. The problem with foreclosure is if the house doesn't sell for the loan amount, they will come after her for the remaining balance.
Did she look into reinstating the house and then trying to sell it? Anytime during foreclosure you can reinstate or payoff the loan, but many people don't realize that.
If you have any questions, let me know. I used to work at a law firm that handled foreclosure (we did the foreclosing).